13
0
livetrax/libs/audiographer/private/limiter/limiter.h

129 lines
2.2 KiB
C
Raw Normal View History

/*
* Copyright (C) 2010-2018 Fons Adriaensen <fons@linuxaudio.org>
* Copyright (C) 2021 Robin Gareus <robin@gareus.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _PEAKLIM_H
#define _PEAKLIM_H
#include <stdint.h>
namespace AudioGrapherDSP {
class Limiter
{
public:
Limiter ();
~Limiter ();
void init (float fsamp, int nchan);
void fini ();
void set_inpgain (float);
void set_threshold (float);
void set_release (float);
void set_truepeak (bool);
int
get_latency () const
{
return _delay;
}
void
get_stats (float* peak, float* gmax, float* gmin)
{
*peak = _peak;
*gmax = _gmax;
*gmin = _gmin;
_rstat = true;
}
void process (int nsamp, float const* inp, float* out);
private:
class Histmin
{
public:
void init (int hlen);
float write (float v);
float vmin () { return _vmin; }
private:
enum {
SIZE = 32,
MASK = SIZE - 1
};
int _hlen;
int _hold;
int _wind;
float _vmin;
float _hist[SIZE];
};
class Upsampler
{
public:
Upsampler ();
~Upsampler ();
void init (int nchan);
void fini ();
int
get_latency () const
{
return 23;
}
float process_one (int chn, float const x);
private:
int _nchan;
float** _z;
};
float _fsamp;
int _nchan;
bool _truepeak;
float** _dly_buf;
float* _zlf;
int _delay;
int _dly_mask;
int _dly_ridx;
int _div1, _div2;
int _c1, _c2;
float _g0, _g1, _dg;
float _gt, _m1, _m2;
float _w1, _w2, _w3, _wlf;
float _z1, _z2, _z3;
bool _rstat;
float _peak;
float _gmax;
float _gmin;
Upsampler _upsampler;
Histmin _hist1;
Histmin _hist2;
};
}
#endif